[linux-2.6-block.git] / arch / x86 / ia32 / ia32_signal.c

/*
 *  linux/arch/x86_64/ia32/ia32_signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
 *  2000-12-*   x86-64 compatibility mode signal handling by Andi Kleen
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/compat.h>
#include <linux/binfmts.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/fpu/internal.h>
#include <asm/fpu/signal.h>
#include <asm/ptrace.h>
#include <asm/ia32_unistd.h>
#include <asm/user32.h>
#include <asm/sigcontext32.h>
#include <asm/proto.h>
#include <asm/vdso.h>
#include <asm/sigframe.h>
#include <asm/sighandling.h>
#include <asm/sys_ia32.h>
#include <asm/smap.h>

/*
 * Do a signal return; undo the signal stack.
 */
#define loadsegment_gs(v)	load_gs_index(v)
#define loadsegment_fs(v)	loadsegment(fs, v)
#define loadsegment_ds(v)	loadsegment(ds, v)
#define loadsegment_es(v)	loadsegment(es, v)

#define get_user_seg(seg)	({ unsigned int v; savesegment(seg, v); v; })
#define set_user_seg(seg, v)	loadsegment_##seg(v)

#define COPY(x)			{		\
	get_user_ex(regs->x, &sc->x);		\
}

#define GET_SEG(seg)		({			\
	unsigned short tmp;				\
	get_user_ex(tmp, &sc->seg);			\
	tmp;						\
})

#define COPY_SEG_CPL3(seg)	do {			\
	regs->seg = GET_SEG(seg) | 3;			\
} while (0)

#define RELOAD_SEG(seg)		{		\
	unsigned int pre = GET_SEG(seg);	\
	unsigned int cur = get_user_seg(seg);	\
	pre |= 3;				\
	if (pre != cur)				\
		set_user_seg(seg, pre);		\
}

static int ia32_restore_sigcontext(struct pt_regs *regs,
				   struct sigcontext_ia32 __user *sc)
{
	unsigned int tmpflags, err = 0;
	void __user *buf;
	u32 tmp;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	get_user_try {
		/*
		 * Reload fs and gs if they have changed in the signal
		 * handler.  This does not handle long fs/gs base changes in
		 * the handler, but does not clobber them at least in the
		 * normal case.
		 */
		RELOAD_SEG(gs);
		RELOAD_SEG(fs);
		RELOAD_SEG(ds);
		RELOAD_SEG(es);

		COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
		COPY(dx); COPY(cx); COPY(ip); COPY(ax);
		/* Don't touch extended registers */

		COPY_SEG_CPL3(cs);
		COPY_SEG_CPL3(ss);

		get_user_ex(tmpflags, &sc->flags);
		regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
		/* disable syscall checks */
		regs->orig_ax = -1;

		get_user_ex(tmp, &sc->fpstate);
		buf = compat_ptr(tmp);
	} get_user_catch(err);

	err |= fpu__restore_sig(buf, 1);

	force_iret();

	return err;
}

asmlinkage long sys32_sigreturn(void)
{
	struct pt_regs *regs = current_pt_regs();
	struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
	sigset_t set;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__get_user(set.sig[0], &frame->sc.oldmask)
	    || (_COMPAT_NSIG_WORDS > 1
		&& __copy_from_user((((char *) &set.sig) + 4),
				    &frame->extramask,
				    sizeof(frame->extramask))))
		goto badframe;

	set_current_blocked(&set);

	if (ia32_restore_sigcontext(regs, &frame->sc))
		goto badframe;
	return regs->ax;

badframe:
	signal_fault(regs, frame, "32bit sigreturn");
	return 0;
}

asmlinkage long sys32_rt_sigreturn(void)
{
	struct pt_regs *regs = current_pt_regs();
	struct rt_sigframe_ia32 __user *frame;
	sigset_t set;

	frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
		goto badframe;

	if (compat_restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return regs->ax;

badframe:
	signal_fault(regs, frame, "32bit rt sigreturn");
	return 0;
}

/*
 * Set up a signal frame.
 */

static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
				 void __user *fpstate,
				 struct pt_regs *regs, unsigned int mask)
{
	int err = 0;

	put_user_try {
		put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
		put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
		put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
		put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);

		put_user_ex(regs->di, &sc->di);
		put_user_ex(regs->si, &sc->si);
		put_user_ex(regs->bp, &sc->bp);
		put_user_ex(regs->sp, &sc->sp);
		put_user_ex(regs->bx, &sc->bx);
		put_user_ex(regs->dx, &sc->dx);
		put_user_ex(regs->cx, &sc->cx);
		put_user_ex(regs->ax, &sc->ax);
		put_user_ex(current->thread.trap_nr, &sc->trapno);
		put_user_ex(current->thread.error_code, &sc->err);
		put_user_ex(regs->ip, &sc->ip);
		put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
		put_user_ex(regs->flags, &sc->flags);
		put_user_ex(regs->sp, &sc->sp_at_signal);
		put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);

		put_user_ex(ptr_to_compat(fpstate), &sc->fpstate);

		/* non-iBCS2 extensions.. */
		put_user_ex(mask, &sc->oldmask);
		put_user_ex(current->thread.cr2, &sc->cr2);
	} put_user_catch(err);

	return err;
}

/*
 * Determine which stack to use..
 */
static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
				 size_t frame_size,
				 void __user **fpstate)
{
	struct fpu *fpu = &current->thread.fpu;
	unsigned long sp;

	/* Default to using normal stack */
	sp = regs->sp;

	/* This is the X/Open sanctioned signal stack switching.  */
	if (ksig->ka.sa.sa_flags & SA_ONSTACK)
		sp = sigsp(sp, ksig);
	/* This is the legacy signal stack switching. */
	else if ((regs->ss & 0xffff) != __USER32_DS &&
		!(ksig->ka.sa.sa_flags & SA_RESTORER) &&
		 ksig->ka.sa.sa_restorer)
		sp = (unsigned long) ksig->ka.sa.sa_restorer;

	if (fpu->fpstate_active) {
		unsigned long fx_aligned, math_size;

		sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
		*fpstate = (struct _fpstate_ia32 __user *) sp;
		if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned,
				    math_size) < 0)
			return (void __user *) -1L;
	}

	sp -= frame_size;
	/* Align the stack pointer according to the i386 ABI,
	 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
	sp = ((sp + 4) & -16ul) - 4;
	return (void __user *) sp;
}

int ia32_setup_frame(int sig, struct ksignal *ksig,
		     compat_sigset_t *set, struct pt_regs *regs)
{
	struct sigframe_ia32 __user *frame;
	void __user *restorer;
	int err = 0;
	void __user *fpstate = NULL;

	/* copy_to_user optimizes that into a single 8 byte store */
	static const struct {
		u16 poplmovl;
		u32 val;
		u16 int80;
	} __attribute__((packed)) code = {
		0xb858,		 /* popl %eax ; movl $...,%eax */
		__NR_ia32_sigreturn,
		0x80cd,		/* int $0x80 */
	};

	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	if (__put_user(sig, &frame->sig))
		return -EFAULT;

	if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
		return -EFAULT;

	if (_COMPAT_NSIG_WORDS > 1) {
		if (__copy_to_user(frame->extramask, &set->sig[1],
				   sizeof(frame->extramask)))
			return -EFAULT;
	}

	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
		restorer = ksig->ka.sa.sa_restorer;
	} else {
		/* Return stub is in 32bit vsyscall page */
		if (current->mm->context.vdso)
			restorer = current->mm->context.vdso +
				selected_vdso32->sym___kernel_sigreturn;
		else
			restorer = &frame->retcode;
	}

	put_user_try {
		put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

		/*
		 * These are actually not used anymore, but left because some
		 * gdb versions depend on them as a marker.
		 */
		put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
	} put_user_catch(err);

	if (err)
		return -EFAULT;

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

	/* Make -mregparm=3 work */
	regs->ax = sig;
	regs->dx = 0;
	regs->cx = 0;

	loadsegment(ds, __USER32_DS);
	loadsegment(es, __USER32_DS);

	regs->cs = __USER32_CS;
	regs->ss = __USER32_DS;

	return 0;
}

int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
			compat_sigset_t *set, struct pt_regs *regs)
{
	struct rt_sigframe_ia32 __user *frame;
	void __user *restorer;
	int err = 0;
	void __user *fpstate = NULL;

	/* __copy_to_user optimizes that into a single 8 byte store */
	static const struct {
		u8 movl;
		u32 val;
		u16 int80;
		u8  pad;
	} __attribute__((packed)) code = {
		0xb8,
		__NR_ia32_rt_sigreturn,
		0x80cd,
		0,
	};

	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	put_user_try {
		put_user_ex(sig, &frame->sig);
		put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
		put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);

		/* Create the ucontext.  */
		if (cpu_has_xsave)
			put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
		else
			put_user_ex(0, &frame->uc.uc_flags);
		put_user_ex(0, &frame->uc.uc_link);
		compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);

		if (ksig->ka.sa.sa_flags & SA_RESTORER)
			restorer = ksig->ka.sa.sa_restorer;
		else
			restorer = current->mm->context.vdso +
				selected_vdso32->sym___kernel_rt_sigreturn;
		put_user_ex(ptr_to_compat(restorer), &frame->pretcode);

		/*
		 * Not actually used anymore, but left because some gdb
		 * versions need it.
		 */
		put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
	} put_user_catch(err);

	err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
	err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
				     regs, set->sig[0]);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

	if (err)
		return -EFAULT;

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;

	/* Make -mregparm=3 work */
	regs->ax = sig;
	regs->dx = (unsigned long) &frame->info;
	regs->cx = (unsigned long) &frame->uc;

	loadsegment(ds, __USER32_DS);
	loadsegment(es, __USER32_DS);

	regs->cs = __USER32_CS;
	regs->ss = __USER32_DS;

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/x86_64/ia32/ia32_signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*
	6	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	7	* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
	8	* 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
1da177e4 LT	9	*/
	10
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4	14	#include <linux/kernel.h>
1da177e4 LT	15	#include <linux/errno.h>
1da177e4 LT	16	#include <linux/wait.h>
1da177e4 LT	17	#include <linux/unistd.h>
	18	#include <linux/stddef.h>
	19	#include <linux/personality.h>
	20	#include <linux/compat.h>
9fbbd4dd	21	#include <linux/binfmts.h>
1da177e4 LT	22	#include <asm/ucontext.h>
1da177e4 LT	23	#include <asm/uaccess.h>
78f7f1e5	24	#include <asm/fpu/internal.h>
fcbc99c4	25	#include <asm/fpu/signal.h>
1da177e4 LT	26	#include <asm/ptrace.h>
	27	#include <asm/ia32_unistd.h>
	28	#include <asm/user32.h>
	29	#include <asm/sigcontext32.h>
1da177e4	30	#include <asm/proto.h>
af65d648	31	#include <asm/vdso.h>
d98f9d84	32	#include <asm/sigframe.h>
f28f0c23	33	#include <asm/sighandling.h>
2f06de06	34	#include <asm/sys_ia32.h>
49b8c695	35	#include <asm/smap.h>
d98f9d84	36
1da177e4 LT	37	/*
	38	* Do a signal return; undo the signal stack.
	39	*/
a967bb3f HS	40	#define loadsegment_gs(v) load_gs_index(v)
	41	#define loadsegment_fs(v) loadsegment(fs, v)
	42	#define loadsegment_ds(v) loadsegment(ds, v)
	43	#define loadsegment_es(v) loadsegment(es, v)
	44
	45	#define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; })
	46	#define set_user_seg(seg, v) loadsegment_##seg(v)
	47
b78a5b52	48	#define COPY(x) { \
3b4b7570	49	get_user_ex(regs->x, &sc->x); \
1da177e4	50	}
1da177e4	51
8801ead4 HS	52	#define GET_SEG(seg) ({ \
	53	unsigned short tmp; \
	54	get_user_ex(tmp, &sc->seg); \
	55	tmp; \
	56	})
	57
	58	#define COPY_SEG_CPL3(seg) do { \
	59	regs->seg = GET_SEG(seg) \| 3; \
	60	} while (0)
1da177e4	61
8c6e5ce0	62	#define RELOAD_SEG(seg) { \
a967bb3f HS	63	unsigned int pre = GET_SEG(seg); \
a967bb3f HS	64	unsigned int cur = get_user_seg(seg); \
8c6e5ce0 HS	65	pre \|= 3; \
8c6e5ce0 HS	66	if (pre != cur) \
a967bb3f	67	set_user_seg(seg, pre); \
8c6e5ce0	68	}
99b9cdf7 TG	69
99b9cdf7 TG	70	static int ia32_restore_sigcontext(struct pt_regs *regs,
6a3713f0	71	struct sigcontext_ia32 __user *sc)
99b9cdf7	72	{
a967bb3f	73	unsigned int tmpflags, err = 0;
ab513701	74	void __user *buf;
99b9cdf7 TG	75	u32 tmp;
	76
	77	/* Always make any pending restarted system calls return -EINTR */
f56141e3	78	current->restart_block.fn = do_no_restart_syscall;
99b9cdf7	79
3b4b7570 HS	80	get_user_try {
	81	/*
	82	* Reload fs and gs if they have changed in the signal
	83	* handler. This does not handle long fs/gs base changes in
	84	* the handler, but does not clobber them at least in the
	85	* normal case.
	86	*/
a967bb3f	87	RELOAD_SEG(gs);
3b4b7570 HS	88	RELOAD_SEG(fs);
	89	RELOAD_SEG(ds);
	90	RELOAD_SEG(es);
	91
	92	COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
6a3713f0	93	COPY(dx); COPY(cx); COPY(ip); COPY(ax);
3b4b7570 HS	94	/* Don't touch extended registers */
	95
	96	COPY_SEG_CPL3(cs);
	97	COPY_SEG_CPL3(ss);
	98
	99	get_user_ex(tmpflags, &sc->flags);
	100	regs->flags = (regs->flags & ~FIX_EFLAGS) \| (tmpflags & FIX_EFLAGS);
	101	/* disable syscall checks */
	102	regs->orig_ax = -1;
	103
	104	get_user_ex(tmp, &sc->fpstate);
	105	buf = compat_ptr(tmp);
3b4b7570 HS	106	} get_user_catch(err);
3b4b7570 HS	107
9dfe99b7	108	err \|= fpu__restore_sig(buf, 1);
5e88353d	109
1daeaa31 BG	110	force_iret();
1daeaa31 BG	111
1da177e4	112	return err;
1da177e4 LT	113	}
1da177e4 LT	114
3fe26fa3	115	asmlinkage long sys32_sigreturn(void)
1da177e4	116	{
3fe26fa3	117	struct pt_regs *regs = current_pt_regs();
3b0d29ee	118	struct sigframe_ia32 __user frame = (struct sigframe_ia32 __user )(regs->sp-8);
1da177e4	119	sigset_t set;
1da177e4 LT	120
	121	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	122	goto badframe;
	123	if (__get_user(set.sig[0], &frame->sc.oldmask)
	124	\|\| (_COMPAT_NSIG_WORDS > 1
99b9cdf7 TG	125	&& __copy_from_user((((char *) &set.sig) + 4),
99b9cdf7 TG	126	&frame->extramask,
1da177e4 LT	127	sizeof(frame->extramask))))
	128	goto badframe;
	129
905f29e2	130	set_current_blocked(&set);
99b9cdf7	131
6a3713f0	132	if (ia32_restore_sigcontext(regs, &frame->sc))
1da177e4	133	goto badframe;
6a3713f0	134	return regs->ax;
1da177e4 LT	135
	136	badframe:
	137	signal_fault(regs, frame, "32bit sigreturn");
	138	return 0;
99b9cdf7	139	}
1da177e4	140
3fe26fa3	141	asmlinkage long sys32_rt_sigreturn(void)
1da177e4	142	{
3fe26fa3	143	struct pt_regs *regs = current_pt_regs();
3b0d29ee	144	struct rt_sigframe_ia32 __user *frame;
1da177e4	145	sigset_t set;
1da177e4	146
3b0d29ee	147	frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);
1da177e4 LT	148
	149	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	150	goto badframe;
	151	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	152	goto badframe;
	153
905f29e2	154	set_current_blocked(&set);
99b9cdf7	155
6a3713f0	156	if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
1da177e4 LT	157	goto badframe;
1da177e4 LT	158
90268439	159	if (compat_restore_altstack(&frame->uc.uc_stack))
1da177e4 LT	160	goto badframe;
1da177e4 LT	161
6a3713f0	162	return regs->ax;
1da177e4 LT	163
1da177e4 LT	164	badframe:
99b9cdf7	165	signal_fault(regs, frame, "32bit rt sigreturn");
1da177e4	166	return 0;
99b9cdf7	167	}
1da177e4 LT	168
	169	/*
	170	* Set up a signal frame.
	171	*/
	172
99b9cdf7	173	static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
ab513701	174	void __user *fpstate,
99b9cdf7	175	struct pt_regs *regs, unsigned int mask)
1da177e4	176	{
a967bb3f	177	int err = 0;
1da177e4	178
3b4b7570	179	put_user_try {
a967bb3f HS	180	put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
	181	put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
	182	put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
	183	put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);
3b4b7570 HS	184
	185	put_user_ex(regs->di, &sc->di);
	186	put_user_ex(regs->si, &sc->si);
	187	put_user_ex(regs->bp, &sc->bp);
	188	put_user_ex(regs->sp, &sc->sp);
	189	put_user_ex(regs->bx, &sc->bx);
	190	put_user_ex(regs->dx, &sc->dx);
	191	put_user_ex(regs->cx, &sc->cx);
	192	put_user_ex(regs->ax, &sc->ax);
51e7dc70	193	put_user_ex(current->thread.trap_nr, &sc->trapno);
3b4b7570 HS	194	put_user_ex(current->thread.error_code, &sc->err);
	195	put_user_ex(regs->ip, &sc->ip);
	196	put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
	197	put_user_ex(regs->flags, &sc->flags);
	198	put_user_ex(regs->sp, &sc->sp_at_signal);
	199	put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
	200
	201	put_user_ex(ptr_to_compat(fpstate), &sc->fpstate);
	202
	203	/* non-iBCS2 extensions.. */
	204	put_user_ex(mask, &sc->oldmask);
	205	put_user_ex(current->thread.cr2, &sc->cr2);
	206	} put_user_catch(err);
1da177e4 LT	207
	208	return err;
	209	}
	210
	211	/*
	212	* Determine which stack to use..
	213	*/
235b8022	214	static void __user get_sigframe(struct ksignal ksig, struct pt_regs *regs,
3c1c7f10	215	size_t frame_size,
0ff8fef4	216	void __user **fpstate)
1da177e4	217	{
c5bedc68	218	struct fpu *fpu = &current->thread.fpu;
65ea5b03	219	unsigned long sp;
1da177e4 LT	220
1da177e4 LT	221	/* Default to using normal stack */
65ea5b03	222	sp = regs->sp;
1da177e4 LT	223
1da177e4 LT	224	/* This is the X/Open sanctioned signal stack switching. */
235b8022 AV	225	if (ksig->ka.sa.sa_flags & SA_ONSTACK)
235b8022 AV	226	sp = sigsp(sp, ksig);
1da177e4	227	/* This is the legacy signal stack switching. */
8bee3f0a	228	else if ((regs->ss & 0xffff) != __USER32_DS &&
235b8022 AV	229	!(ksig->ka.sa.sa_flags & SA_RESTORER) &&
	230	ksig->ka.sa.sa_restorer)
	231	sp = (unsigned long) ksig->ka.sa.sa_restorer;
1da177e4	232
c5bedc68	233	if (fpu->fpstate_active) {
72a671ce SS	234	unsigned long fx_aligned, math_size;
72a671ce SS	235
82c0e45e	236	sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
0ff8fef4	237	fpstate = (struct _fpstate_ia32 __user ) sp;
c8e14041	238	if (copy_fpstate_to_sigframe(fpstate, (void __user )fx_aligned,
72a671ce	239	math_size) < 0)
99ea1b93	240	return (void __user *) -1L;
3c1c7f10 SS	241	}
3c1c7f10 SS	242
65ea5b03	243	sp -= frame_size;
d347f372 MO	244	/* Align the stack pointer according to the i386 ABI,
d347f372 MO	245	* i.e. so that on function entry ((sp + 4) & 15) == 0. */
65ea5b03 PA	246	sp = ((sp + 4) & -16ul) - 4;
65ea5b03 PA	247	return (void __user *) sp;
1da177e4 LT	248	}
1da177e4 LT	249
235b8022	250	int ia32_setup_frame(int sig, struct ksignal *ksig,
99b9cdf7	251	compat_sigset_t set, struct pt_regs regs)
1da177e4	252	{
3b0d29ee	253	struct sigframe_ia32 __user *frame;
99b9cdf7	254	void __user *restorer;
1da177e4	255	int err = 0;
ab513701	256	void __user *fpstate = NULL;
1da177e4	257
99b9cdf7 TG	258	/* copy_to_user optimizes that into a single 8 byte store */
	259	static const struct {
	260	u16 poplmovl;
	261	u32 val;
	262	u16 int80;
99b9cdf7 TG	263	} __attribute__((packed)) code = {
	264	0xb858, /* popl %eax ; movl $...,%eax */
	265	__NR_ia32_sigreturn,
	266	0x80cd, /* int $0x80 */
99b9cdf7 TG	267	};
99b9cdf7 TG	268
235b8022	269	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
1da177e4 LT	270
1da177e4 LT	271	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
3d0aedd9	272	return -EFAULT;
1da177e4	273
2ba48e16	274	if (__put_user(sig, &frame->sig))
3d0aedd9	275	return -EFAULT;
1da177e4	276
2ba48e16	277	if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
3d0aedd9	278	return -EFAULT;
1da177e4 LT	279
1da177e4 LT	280	if (_COMPAT_NSIG_WORDS > 1) {
2ba48e16 HS	281	if (__copy_to_user(frame->extramask, &set->sig[1],
2ba48e16 HS	282	sizeof(frame->extramask)))
3d0aedd9	283	return -EFAULT;
1da177e4	284	}
1da177e4	285
235b8022 AV	286	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
235b8022 AV	287	restorer = ksig->ka.sa.sa_restorer;
af65d648 RM	288	} else {
af65d648 RM	289	/* Return stub is in 32bit vsyscall page */
1a3e4ca4	290	if (current->mm->context.vdso)
6f121e54 AL	291	restorer = current->mm->context.vdso +
6f121e54 AL	292	selected_vdso32->sym___kernel_sigreturn;
af65d648	293	else
ade1af77	294	restorer = &frame->retcode;
af65d648	295	}
99b9cdf7	296
3b4b7570 HS	297	put_user_try {
	298	put_user_ex(ptr_to_compat(restorer), &frame->pretcode);
	299
	300	/*
	301	* These are actually not used anymore, but left because some
	302	* gdb versions depend on them as a marker.
	303	*/
0ff8fef4	304	put_user_ex(((u64 )&code), (u64 __user *)frame->retcode);
3b4b7570 HS	305	} put_user_catch(err);
3b4b7570 HS	306
1da177e4	307	if (err)
3d0aedd9	308	return -EFAULT;
1da177e4 LT	309
1da177e4 LT	310	/* Set up registers for signal handler */
65ea5b03	311	regs->sp = (unsigned long) frame;
235b8022	312	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
1da177e4	313
536e3ee4	314	/* Make -mregparm=3 work */
65ea5b03 PA	315	regs->ax = sig;
	316	regs->dx = 0;
	317	regs->cx = 0;
536e3ee4	318
b6edbb1e JF	319	loadsegment(ds, __USER32_DS);
b6edbb1e JF	320	loadsegment(es, __USER32_DS);
1da177e4	321
99b9cdf7 TG	322	regs->cs = __USER32_CS;
99b9cdf7 TG	323	regs->ss = __USER32_DS;
1da177e4	324
1d001df1	325	return 0;
1da177e4 LT	326	}
1da177e4 LT	327
235b8022	328	int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
99b9cdf7	329	compat_sigset_t set, struct pt_regs regs)
1da177e4	330	{
3b0d29ee	331	struct rt_sigframe_ia32 __user *frame;
af65d648	332	void __user *restorer;
1da177e4	333	int err = 0;
ab513701	334	void __user *fpstate = NULL;
1da177e4	335
99b9cdf7 TG	336	/* __copy_to_user optimizes that into a single 8 byte store */
	337	static const struct {
	338	u8 movl;
	339	u32 val;
	340	u16 int80;
9cc3c49e	341	u8 pad;
99b9cdf7 TG	342	} __attribute__((packed)) code = {
	343	0xb8,
	344	__NR_ia32_rt_sigreturn,
	345	0x80cd,
	346	0,
	347	};
	348
235b8022	349	frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
1da177e4 LT	350
1da177e4 LT	351	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
3d0aedd9	352	return -EFAULT;
1da177e4	353
3b4b7570 HS	354	put_user_try {
	355	put_user_ex(sig, &frame->sig);
	356	put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
	357	put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);
1da177e4	358
3b4b7570 HS	359	/* Create the ucontext. */
	360	if (cpu_has_xsave)
	361	put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
	362	else
	363	put_user_ex(0, &frame->uc.uc_flags);
	364	put_user_ex(0, &frame->uc.uc_link);
bd1c149a	365	compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
3b4b7570	366
235b8022 AV	367	if (ksig->ka.sa.sa_flags & SA_RESTORER)
235b8022 AV	368	restorer = ksig->ka.sa.sa_restorer;
3b4b7570	369	else
6f121e54 AL	370	restorer = current->mm->context.vdso +
6f121e54 AL	371	selected_vdso32->sym___kernel_rt_sigreturn;
3b4b7570 HS	372	put_user_ex(ptr_to_compat(restorer), &frame->pretcode);
	373
	374	/*
	375	* Not actually used anymore, but left because some gdb
	376	* versions need it.
	377	*/
0ff8fef4	378	put_user_ex(((u64 )&code), (u64 __user *)frame->retcode);
3b4b7570	379	} put_user_catch(err);
1da177e4	380
235b8022	381	err \|= copy_siginfo_to_user32(&frame->info, &ksig->info);
5e88353d PA	382	err \|= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
	383	regs, set->sig[0]);
	384	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	385
1da177e4	386	if (err)
3d0aedd9	387	return -EFAULT;
1da177e4 LT	388
1da177e4 LT	389	/* Set up registers for signal handler */
65ea5b03	390	regs->sp = (unsigned long) frame;
235b8022	391	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
1da177e4	392
a7aacdf9	393	/* Make -mregparm=3 work */
65ea5b03 PA	394	regs->ax = sig;
	395	regs->dx = (unsigned long) &frame->info;
	396	regs->cx = (unsigned long) &frame->uc;
a7aacdf9	397
b6edbb1e JF	398	loadsegment(ds, __USER32_DS);
b6edbb1e JF	399	loadsegment(es, __USER32_DS);
99b9cdf7 TG	400
	401	regs->cs = __USER32_CS;
	402	regs->ss = __USER32_DS;
1da177e4	403
1d001df1	404	return 0;
1da177e4	405	}